IEC 60118的本部分给出了常见助听器功能的定义，如降噪或反馈减少等。仅考虑声学输入。本文档目前未涵盖双耳功能。此外，描述了用于验证助听器功能的测量程序。目标不是评估功能的性能，而是验证其存在和功能。购买本文件时可获得的所有当前修订均包含在购买本文件中。

This part of IEC 60118 gives definitions for common hearing aid features such as noise reduction or feedback reduction, etc. Only acoustical inputs are considered. Binaural features are currently not covered in this document. In addition, measurement procedures are described to verify hearing aid features. The objective is not to evaluate the performance of features but to verify their existence and functionality.All current amendments available at time of purchase are included with the purchase of this document.